I have a question regarding Relay X1. Normally I can switch the relay on or off with my FEZ Spider and then a circuit will be closed. But I need something which informs my board by itself if the circuit is closed, e.g. when someone rings a doorbell. And now my questions:
Can I use the relay both ways so that’ll inform my board if some other source has switched it on or off? If not is there a way I can do this?
Thanks in advance for your help,